BoingBoing's Mark Frauenfelder offers 8 ways to be a "web sleuth" using online tools. Track down someone's previous address using ZabaSearch, the value of a home with Zillow and recall previous incarnations of web sites with the Internet Archive. Log onto sites without handing over your email address with BugMeNot and surf anonymously with a free proxy. (Add "spy on someone's cat with Google Maps Street View" to the list.) None of these will be new news to advanced lifehackers, but it's fun to see all these personal information and privacy tools all grouped together into one master list.